What's the best way to do insert variables in a string in JavaScript? I'm guessing it's not this:
var coordinates = "x: " + x + ", y: " + y;
In Java, String
s are immutable and doing something like the above would unnecessarily create and throw away String
s. Ruby is similar and has a nice way of doing the above:
coordinates = "x: #{x}, y: #{y}"
Does something similar exist for JavaScript?
To declare variables in JavaScript, you need to use the var, let, or const keyword. Whether it is a string or a number, use the var, let, or const keyword for its declaration. But for declaring a string variable we had to put the string inside double quotes or single quotes.
Basic JavaScript Addition Add numbers in JavaScript by placing a plus sign between them. You can also use the following syntax to perform addition: var x+=y; The "+=" operator tells JavaScript to add the variable on the right side of the operator to the variable on the left.
This example uses the “ s string interpolator,” which lets you embed variables inside a string, where they're replaced by their values.
Introduced in ES6 as "template strings"
MDN docs: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals
const name = "Nick"
const greeting = `Hello ${name}` // "Hello Nick"
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